Grinding attachment for check-valves.



PATENTED APR. 14, 190s. MxPf'MAXWELL. GRINDING ATTACHMENT FOR CHECK VA LVBS.

APPLICATION FILED SEPT. 26, 1907.

INVENTORQ M712 Z i022 Jfaxw'eii WITNESSES H/VEYS i U ITED STATES PATENT oniuon.

MILTON P. MAXWELL, or HALSEY, OREGQ N.

GRINDING ATTACHMENT non clm cx-viirivns.

Specification of Letters Patent.

Patented April 14, 1908.

Application filed September 26, 1,907. Serial N 0. 394,661.

i and quickly regrinding the check valve on its 6 7 seat whenever desir and without requir ing opening of the check valve casing or disconnecting the same.

The invention consists of novel features and Lparts and combinations of the same, whic will be more fully described hereinafter and then pointed'out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corre-. sponding parts in both views.

Figure 1 is a sectional side elevation of the improvement as-applied and in a non-active position, and Fig. 2 IS a like view of the same, parts being in elevation, the improvement eini 1n an active position for regrinding the chec valve on its seat.

. The body A, of the check valve is provided with the usual valve seat B, on which is adapted to be seated the valve C, having its short valve stem 0 extending loosely in the bonnet D, screwed or otherwise secured to the valve body A and provided with a suitable packi nut E. he upper-outer end of the stem of the valve Cis provided with a recess 0, adapted to be engaged by a plug F, dependin from the lower end of a rod or shank F, slifably held in the bonnet D and nut E, and carrying at its upper, outer end a handle F for conveniently manipulating the rod or shank F whenever it is desired to regrind the valve C at the time the valve is eldfirmly to its seat B. The handle F? is provided at the top with a cross slot F for the application of a screw driver or other tool to turn the rod F when regrinding the valve 0. Normally the rod F is held by frictional contact with the packing E in the nut E in an uppermost inactive position, as

shown in Fig. 1, to allow the valve C to function in the usual manner, but when it is desired to regrindthe valve C on. its seat B, then the operator pushes the rod vF down- ,ward to engage: the lug F with ,the recess C and then turns the rod F, so as to turn the valve Owith it while the latter is on itsscat B.

In order ,ii hold the valve C with the de-' sired forcedown on its seat B during the regrinding operation, the following arrangement is made: On the upper threaded end E of the packin nut E screws a feed nut G having handles to permit the operator to conveniently screw the nut G up or down on the threaded end E of the acking nut E. The feed nut G is adapted to bear on a pin H held on the rod or shank F, so that when the feed nut G is screwed down on the. packing nut IE, it moves the pin H andconse uently the rod F downward, to firmly ho d the valve C to its seat B during the regrinding operation, that is, during the time the rod F is turned, While engaged with the stem 0 of the valve C. After the valve C is reground on its seat B, the feed or retainingnut G is screwed upward and then the rod F is lifted back into its normal inactive position, as shown. in Fig. 1. It is understood that the rod F serves practically as a screw driver for turning the valve C, and the rod F is fed downward by the operator screwing the feed nut G downward during the regrinding operation.

The device is very simple and durable in construction and can be readily applied to check valves as heretoforeconstructed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination withthe check valve body, of a-stem, means in connection with the stem for locking the valve thereto, a pin arranged transversely of thestem, a feed nut on the body engaging the in, and a packing for frictionally retaining t 1e stem out of engagement with the valve.

2. The combination with the check valve body, of & stein, means in connection with I in testimony Wherebf I have signed my the stem for locking the stem in the valve, :1 1 name to this specification in the presence of pin arranged transversely of the stem, a feed two subscribingwitnesses.

nut on the body engaging the pin, a packing MILTON P. MAXWELL. 5 for frictionally retaming the stem out of en- Witnesses:

agement with the valve, and a packing nut- J No'. W. BREssLER,

for expanding the packing. W. H. WALTON. 

